In terms of politics, Mayor Diamond Joe Quimby character is a satire of corrupt and promiscuous politicians. In pop culture, politicians are usually the ones targeted for satire. If we were to analyze his name, we’d notice that its practically a gimmick. “Diamond” represents the corruptness of Quimby and his raid of the town’s treasury, whereas “Joe” attracts the ‘average Joe” population: pretty much everyone in Springfield, with an exception to Mr. Burns, Krusty, and the Mafia. He’s never shown in a good light on the show. He is married, but that doesn’t stop his promiscuous ways. For example, “Marge vs. The Monorail”, Marge volunteered her answer to fix the cracks and potholes in Main Street, yet the Mayor didn't bother to listen to Marge
